[client] Implement MCP OAuth scope selection and step-up authorization#1324

pcarleton merged 23 commits intomodelcontextprotocol:mainmodelcontextprotocol/python-sdk:mainfrom

dogacancolak:dogacan/mcp-python-sdk/fix-oauth-scope-handlingdogacancolak/mcp-python-sdk:dogacan/mcp-python-sdk/fix-oauth-scope-handlingCopy head branch name to clipboard